N.Y. Veh. & Traf. Law § 218

§ 218. Special classification of vehicles. Notwithstanding any other\nprovision of this chapter, any vehicle or class of vehicles may, by\nregulation of the commissioner, be added to or exempted from any of the\ndefinitions or classifications contained in this chapter, where such\naddition or exemption is deemed, in his discretion, either necessary,\ndesirable or equitable because of the particular characteristics of such\nvehicle or class of vehicles; provided, however, that no vehicle which\nis exempted from registration by any provision of this chapter may be\nreclassified pursuant to this section to require registration, and no\nvehicle which is specifically enumerated in schedule F of subdivision\nseven of section four hundred one of this chapter may be reclassified\npursuant to this section to require registration at an increased fee.\n